n. 大门；入口；通道（door 的复数）
behind closed doors暗中地；与外界隔绝地
1.We had to put new locks on all the doors.
我们只好把所有的门都安上新锁。
2.Doors and windows are an easy target for burglars.
门窗被窃贼作为入室的目标容易得手。
3.The bronze doors are covered with sculpted reliefs.
青铜门上覆有浮雕。
4.Modern trains have automatic doors.
现代火车都有自动门。
5.The elevator doors parted and out stepped the President.
电梯门打开了，总统从里面步出。
6.The doors open and shut automatically.
这些门都是自动开关的。
7.The automatic doors slid open.
自动门慢慢开了。